The world just passed a quiet milestone, topping 8 billion people on Earth. Embedded in this demographic story is an important developmental one: We are healthier, wealthier, and better educated than at any time in human history. And yet, macro numbers offer little solace to the 800 million people who still lack access to electricity, or the roughly same amount who go to sleep hungry. The COVID-19 pandemic exacerbated many of the existing inequalities in our world and added a range of new problems, from supply...